linux-kernel - Re: [PATCH v5 4/7] platform/chrome: Add Chrome OS EC userspace device interface

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Date:	Thu, 26 Feb 2015 09:38:43 -0800
From:	Olof Johansson <olof@...om.net>
To:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
Cc:	Gwendal Grignou <gwendal@...omium.org>,
	Lee Jones <lee.jones@...aro.org>,
	Doug Anderson <dianders@...omium.org>,
	Bill Richardson <wfrichar@...omium.org>,
	Simon Glass <sjg@...gle.com>, Jonathan Corbet <corbet@....net>,
	Varka Bhadram <varkabhadram@...il.com>,
	Paul Bolle <pebolle@...cali.nl>,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 4/7] platform/chrome: Add Chrome OS EC userspace device interface

On Thu, Feb 26, 2015 at 1:08 AM, Javier Martinez Canillas
<javier.martinez@...labora.co.uk> wrote:
> Hello Olof,
>
> Thanks a lot for your feedback.
>
> On 02/26/2015 02:13 AM, Gwendal Grignou wrote:
>> Olof,
>>
>> I think the way Javier did it is fine, the 'major' of the ioctl is
>> 0xEC, from ':'.
>>
>> Gwendal.
>>
>
> As Gwendal said, I deliberately changed the IOCTL mayor number to
> make it different in both kernels.
>
> downstream:
>
> #define CROS_EC_DEV_IOC              ':'
> #define CROS_EC_DEV_IOCXCMD    _IOWR(':', 0, struct cros_ec_command)
> #define CROS_EC_DEV_IOCRDMEM   _IOWR(':', 1, struct cros_ec_readmem)
>
> mainline:
>
> #define CROS_EC_DEV_IOC       0xEC
> #define CROS_EC_DEV_IOCXCMD   _IOWR(CROS_EC_DEV_IOC, 0, struct cros_ec_command)
> #define CROS_EC_DEV_IOCRDMEM  _IOWR(CROS_EC_DEV_IOC, 1, struct cros_ec_readmem)
>
> I can also do what you suggested and keep ':' as the major and use 2/3
> as command numbers but I just think 0xEC is a much nicer major for the
> interface to talk with the Embedded Controller and it was available ;)

No, changing major is definitely sufficient and an acceptable way to
do it -- I had missed that you did so.

Thanks, Javier, Gwendal, I'll apply this today and push out. Gwendal
has been giving it a go on a machine here too so I'll check with him
before I push.


-Olof
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